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Author: balasubramanian muralikrishnan

Displaying records 11 to 20 of 35 records.
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11. A Model for Geometry-Dependent Errors in Length Artifacts
Series: Journal of Research (NIST JRES)
Report Number: 117.013
Published: 9/27/2012
Authors: Daniel S Sawyer, Brian Parry, Christopher J Blackburn, Balasubramanian Muralikrishnan, Steven David Phillips
Abstract: We present a detailed model of dimensional changes in long length artifacts, such as step gauges and ball bars, due to bending under gravity. The comprehensive model is based on evaluation of the gauge points relative to the neutral bending surf ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910861

12. Stylus Tip-Size Effect on the Calibration of Periodic Roughness Specimens with Rectangular Profiles
Published: 3/21/2012
Authors: Thomas B Renegar, Johannes A Soons, Balasubramanian Muralikrishnan, John S Villarrubia, Xiaoyu A Zheng, Theodore Vincent Vorburger, Jun-Feng Song
Abstract: Stylus instruments are widely used for surface characterization. It is well known that the size and shape of the stylus tip affects the measured surface geometry and parameters. In most cases, increasing the tip size decreases the measured Ra value b ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911079

13. Performing three dimensional measurements on micro-scale features using a flexible CMM fiber probe with ellipsoidal tip
Published: 1/5/2012
Authors: Balasubramanian Muralikrishnan, Jack A Stone Jr, Craig M Shakarji, John Richard Stoup
Abstract: The tip of a traditional CMM probe used for measurements of macro-scale artifacts is generally a sphere of excellent geometry. Its known diameter (from a prior calibration) and form along with the known approach direction (which is normal to the surf ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909420

14. Performance Evaluation Experiments on a Laser Spot Triangulation Probe
Published: 11/25/2011
Authors: Balasubramanian Muralikrishnan, Wei Ren, Dennis S Everett, Eric S Stanfield, Theodore D Doiron
Abstract: Laser triangulation probes are increasingly used for dimensional measurements in a variety of applications. At the National Institute of Standards and Technology, we have recently explored the use of laser spot triangulation probes to determine dimen ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908474

15. NON-CONTACT DIMENSIONAL MEASUREMENTS OF BIPOLAR FUEL CELL PLATES
Published: 11/15/2011
Authors: Balasubramanian Muralikrishnan, Wei Ren, Dennis S Everett, Eric S Stanfield, Theodore D Doiron
Abstract: Non-contact dimensional measurement of fuel cell plates is critical to the eventual rapid manufacture by supporting in-process measurement and control. This need has been identified by the Department of Energy‰s Hydrogen Program, and by numerous manu ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909299

16. Dimensional Metrology of Bipolar Fuel Cell Plates Using Laser Spot Triangulation Probes
Published: 3/22/2011
Authors: Balasubramanian Muralikrishnan, Wei Ren, Dennis S Everett, Eric S Stanfield, Theodore D Doiron
Abstract: As in any engineering component, manufacturing a bipolar fuel cell plate for a polymer electrolyte membrane (PEM) hydrogen fuel cell power stack to within its stated design tolerances is critical in achieving the intended function. In a bipolar fuel ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907747

17. Geometric effects when measuring small holes with micro contact probes.
Published: 3/1/2011
Authors: Jack A Stone Jr, Balasubramanian Muralikrishnan, Chittaranjan Sahay
Abstract: A coordinate measuring machine with a suitably small probe can be used to measure micro-features such as the diameter and form of small holes (often about 100 micrometers in diameter). When measuring small holes, the clearance between the probe tip a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903665

18. Measuring Scale Errors in a Laser Tracker s Horizontal Angle Encoder through Simple Length Measurement and Two-face System Tests
Published: 11/1/2010
Authors: Balasubramanian Muralikrishnan, Christopher J Blackburn, Daniel S Sawyer, Steven David Phillips, Robert Bridges, Quan Ma
Abstract: We describe a method to estimate the scale errors in the horizontal angle encoder of a laser tracker in this paper. The method does not require expensive instrumentation such as a rotary stage or even a calibrated artifact. An uncalibrated but stable ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904221

19. Micro-feature dimensional and form measurements with the NIST fiber probe on a CMM
Published: 7/30/2010
Authors: Balasubramanian Muralikrishnan, Jack A Stone Jr, John Richard Stoup, Chittaranjan Sahay
Abstract: The NIST fiber probe is a Coordinate Measuring Machine (CMM) probing system intended for diameter and form measurement of micro features and small holes. This Moore M48 CMM at NIST can measure holes down to 500 um diameter with the Movamatic probe; t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903944

20. Choosing test positions for laser tracker evaluation and future Standards development
Published: 7/15/2010
Authors: Balasubramanian Muralikrishnan, Daniel S Sawyer, Christopher J Blackburn, Steven David Phillips, Craig M Shakarji, Ed Morse, Robert Bridges
Abstract: A working group within the ISO TC 213 committee is developing a draft document [11] for evaluating the performance of laser trackers. The ASME B89.4.19 Standard [1] and the draft VDI/VDE 2617 part 10 [2] describe some useful tests that are incorporat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905959



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